Piston for internal-combustion motors



Oct. 16,1928. A. c. HOECKER T PISTON FOR INTERNAL COMBUSTION MOTORS Filed Jan. 28. 1925 Patented a. 16, .1928.

ALBERT o. HOECKER, orsr. LOUISf-MISSOURI, AssIeNoRoF oNn-THIRn'r'o'PAUL r;

KRAUSE, OF ST. LOUIS, MISSOURI.

PISTON FORiNTERNAL-CGMBUSTION Morons;

Application filed January 28 41925? Serial No. 5,214.

ition' relates to an improvement for internal combustion motors or its primary object, the .purpose g niprovenientsin the skirtv of or allowing for the thermalexthe piston. v object 01 the invention is in -pro.- vio' the skirt oft-he piston with improved "for eliminatingback-slap.

ther object of the invention: is in prothe SKlltoi the piston witha series .ve'rsely disposed slots which extend 'h the thickness oi the skirt wall.

ll further object of the invention is in providing the piston skirt with transiersely disposed arcuate portions which are adapted to move towards the open end of the p t by the pressure of the cylinder wall heated conditions of the cylinder and piston. i r

Other and further objects will appear in the 'vechication and be specifically pointed the appended claims reference being 0 the accompanying drawings exe'mplithe invention, and in which,

. 1 is a s de elevation of the thrust side in'iproved piston. 2 a side elevation of the pin bearthe piston partly shown in sec- 3 is a horizontal line Ill lll of Fig. 1'

Fig. +1 is a side elevation of a piston hearing a modified improvement in the thrust side of the piston.

l Vith reference to the accompanying drawings, 1 designates the closedend of the piston having the usual packing ring recesses 2 for the reception of the packing rings 3 and extending from the closed end 1 is the skirt l, having oppositely disposed pin bosses 5 which extend inwardly from. the skirt wall. Gppositely disposed from one another and rght-angles to the pin bosses 5, are the t the skirt 1, each of said thrustsides 6 be- 'ng provided with a series of transversely c isposed arcuate slots 7 which provide sepa: rate cylinder engaging portions 8. The arcuate slots '7 are disposed so that the sepal-Jo rated portions 8 will extend downwardly towards the open end 9 of the skirt so that said portions can be forced downwardly by a pressure exerted thereto from the cyllnder wall.

1 0i theskirhj section taken on the 1 g hrust sides 6 of the piston which are a part the cylinder wall.

of the piston on, the linelS in Fig. is approximately equal to the diameter of the portion10, the periphery of the pin bearing.

sides 12 of the skirtbefng tapered .ofl' as designated at 14 in Fig. 3 to meet thecylinder bearingperiphery' of the thrust This improved piston when adapted for a particular cylinder-is made to a sizewherein the perphery of the separated portions 8 of the thrust sides 6 will snugly engageop posite sides of the cylinder, whereas, the

(rt-the skjirt taken acrossthe; thrust sides of the piston as indicated by the dotted line 11 p v lvhereasythe diameter of theskirt taken; across the pin bearing sides 12 lower portion 10 of the skirt and the pin bearing sides 12 thereofwill be short of en gaging the cylinder wall when the piston and cylinder is in a cool condition.

In the operation of this improvedpiston,

when heated conditions are brought about rel- .ative to the cylinder and piston, the separated portions 8 which originally engaged the cylinder wall when the cylinder was cool, will'be forced downwardly towards the open end 90f the piston and at the sametime the lower portion 10 and pin bearing portions 12 of the skirt,will expand to an approximate fitting relation with the cylinder, said portions 8, l0 and 12 at no time too tightly engaging the cylinder Wall oil-account of the fact that the portions 8 are resilient andare forced downwardly by the cylinder wall pressure,while the portions 10 and 12 are turned or groundto diameters wherein the manmum expansion thereof will be no greater.

than to properly engage the cylinder wall under maximum thermal conditions of the 7 cylinder and piston;

-On account of the resiliency provided by the oppositely disposed portions 8 which are formed on the thrust sides of the piston, it is obvious that the back-slap of the piston ordinarily created by the connecting rod throw, will be eliminated on account of the fact that said portions 8 at all times engage The modified structure disclosed in Fig. 4

- will function similar to the structure of Figs.

the vertical axis of the piston, thereby providing a series of separated portions in the entire skirt length,

2. A p'ston having a head and a skirt,

said skirt having a series of transverse slots.

formed therein extending at an angle to the vertical axis of the piston thereby providing a series of: separated portions which are adapted to both inward and outward movement. V I

3. A pston having a head and a skirt, said skirt having a series of transverse slots eX- tending at an'angle to the vertical axis of the piston thereby providing a series of separated portlons Which are adapted to inward movement by the pressure of the cylinder wall of the cylinder in which the piston is operating.

4:. A piston having a head and a skirt, said skirt having a series of transversely extending arcnate slots formed at an angle to the vertical axis ofthe piston.

,5; A piston having a head and a skirt, said skirt having a series of transversely ex; tending'arcuate slots formed in opposite disposition to one another, said slots extending at an angle to the vertical axis oftheipiston.

'6. n piston having a head and" a-skirt, said skirt having a series of transversely extending arcuate slots formed therein disposed angular to the vertical axis of the piston" and in oppositedisposition to oneanother, thereby providing a series of separated portions Which extend the entire length of the skirt.

ALBERT C. HOE CKER 

